Wiredgeorge, thanks for the reply.
You may remember me from my posting last Fall/Winter regarding this bike.
I will try to be less confusing.
It doesn't seem to matter what gear. Small throttle opening, everything is ok at all RPMs.
Slowly accelerate in 1st or 2nd gear, to 7,000 RPM and there is no missing or bog. It's smooth all the way up. Have not tried that in higher gears yet. Have not tired to take it to any higher RPM yet.
Problem is with about 3/4 (more or less) throttle to wide open throttle. More than just a bog. It misses terribly, spuuters loudly and actually looses RPM. Worse at low RPM. If I do it at higher RPM it stumbles/misses for a few seconds without slowing down and then suddenly it clears up and goes like a bat-outta-****.
It's a little scary because you don't know when it will clear up. There is no warning. Suddenly it just takes off. If I hold full throttle long enough, it will always clear up eventually, regardless what RPM. Took a while ... several test drives to work up enough courage where I could hold it at WOT long enough to verify this.
I believe if it was too lean, it would not clear up no matter how long I held it at WOT. Adding "choke" seems to yield more evidence that it's not too lean, because it does not help at all. Have not been able yet to determine if it is making things worse, however. still need to get the bike inspected. Waiting for tires.
I hear what you are saying about the Dynojet kit and especially the air piston vent hole. Carbs have : unknown main Jet # 132, Keihin pilot Jet # 35. No marking on the needle. I included a photograph if it helps you tell me it's Dynojet or not. It's dirty, yes, I know that.
I'm not sure it installs properly. It travels up and down in the slide by about 1/8". I'm considering putting small springs in under the plastic retainer to bias them down against the slide, yet retain the free movement for self-centering. Any other suggestions ? Do the stock needles fit with less up/down play ?
So according to your experience I am looking at getting stock replacement needles and mains around 135 and pilots around the 40 size.
You mentioned the stock needles should be N14Q. The workshop manual calls for N53I. Also it calls for 112 Main or 118 in California, which I am not. The VIN does not make it to be a CA model either.
I agree, it's worth trying the no-name needles for now and just changing jets. It's just that going from 112 to 135 mains seems like a very big jump, to me. Do you ever "rent" or loan out, a collection of jets ? Too bad my Mikuni jets won't work. I have a bunch of them right in the ballpark of what I'd like to try. Left over from setting up my 850 GS.
I'm planning to remove the breather cover and have a look to see what I can see. In the parts diagram it shows an "orifice" looks like a jet to me for regulating airflow. That piece might be the source of the hiss/whistling. Actually whistling is probably a better description of the sound. Apparently, this bike has always made this sound.
I understand your suggestion about running a length of hose between the breather and filter. Will probably put one on regardless of the noise. Have read that it can also help to prevent the normal amounts of blowby, from expelling oil droplets.